EP1837152A1 - Mold clamping apparatus for injection molding machine - Google Patents

Mold clamping apparatus for injection molding machine Download PDF

Info

Publication number
EP1837152A1
EP1837152A1 EP07104095A EP07104095A EP1837152A1 EP 1837152 A1 EP1837152 A1 EP 1837152A1 EP 07104095 A EP07104095 A EP 07104095A EP 07104095 A EP07104095 A EP 07104095A EP 1837152 A1 EP1837152 A1 EP 1837152A1
Authority
EP
European Patent Office
Prior art keywords
mold
mold clamping
clamping force
force transmitting
platen
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07104095A
Other languages
German (de)
English (en)
French (fr)
Inventor
Koichi Nishimura
Yasuo Naito
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fanuc Corp
Original Assignee
Fanuc Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fanuc Corp filed Critical Fanuc Corp
Publication of EP1837152A1 publication Critical patent/EP1837152A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/1742—Mounting of moulds; Mould supports
    • B29C45/1744—Mould support platens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C2045/1784—Component parts, details or accessories not otherwise provided for; Auxiliary operations not otherwise provided for
    • B29C2045/1788—Preventing tilting of movable mould plate during closing or clamping

Definitions

  • the present invention relates to a mold clamping apparatus for an injection molding machine.
  • a fixed platen and a platen (toggle mechanism mounting platen) to which a toggle mechanism is mounted are connected together on their respective four corners by use of tie bars. And by moving the movable platen in a direction toward the fixed platen along the tie bars by use of the toggle mechanism, a mold (movable side mold) mounted on the movable platen is pressed against a mold (fixed side mold) mounted on the fixed platen.
  • the tie bars become elongated by this pressing and a mold clamping force is given to the molds by the elongation of the tie bars.
  • the force from the tie bars act on the fixed platen at the positions where the tie bars are connected (i.e., peripheral portions of the fixed platen away from the center thereof).
  • the force from the toggle mechanism acts on the movable platen in the areas (i.e., peripheral portions away from the movable platen) where the movable platen engages with the toggle mechanism.
  • the movable side mold is mounted to a center part of the movable platen and the fixed side mold is mounted to a center part of the fixed platen
  • the area where the fixed side mold exerts a force on the fixed platen is different from the area where the tie bar exerts a force on the fixed platen
  • the area where the movable side mold exerts a force on the movable platen is different from the area where the toggle mechanism exerts a force on the movable platen.
  • a mold clamping force acts on the fixed platen and movable platen, to each of which a mold is mounted, (these platens are hereafter called "mold mounting platens") and deflection occurs on these mold mounting platens.
  • the thickness of the mold mounting platen be increased. However, this results in an increase in the weight of the mold mounting platen, causing a rise in the cost of an injection molding machine.
  • FIG. 6 is a schematic diagram to explain the condition in which deflection occurs in mold mounting platens (a fixed platen and a movable platen) of a conventional toggle type mold clamping apparatus.
  • a fixed platen 1 and a toggle mechanism mounting platen 4 are connected together on their respective four corners by use of tie bars 3.
  • One end of a toggle mechanism 6 is mounted on the toggle mechanism mounting platen 4 and the other end of the toggle mechanism 6 is mounted on a movable platen 2. Therefore, when a cross head 6a of the toggle mechanism 6 is moved forward by a driving source such as a motor (not shown), the toggle link expands, moves the movable platen 2 along the tie bar 3 and causes a movable side mold 5b mounted on the movable platen 2 to abut against a fixed side mold 5a mounted on the fixed platen 1. When the toggle link is caused to expand further, the tie bar 3 elongates and generates a mold clamping force by the reaction force of this elongation of the tie bar 3.
  • the points of application of a mold clamping force on the fixed platen 1 generated by the mold clamping apparatus are the positions where the tie bars are mounted. That is, the points of application are in peripheral portions of the fixed platen 1, and not in a center part thereof. In other words, the points of application are at positions outward from the edge of the fixed side mold 5a mounted in the center part of the fixed platen 1.
  • the points of application on the movable platen 2 are the positions where the movable platen 2 is engaged with the toggle mechanism. That is, the points of application are present in peripheral portions (an upper portion and a lower portion) of the movable platen 2, and not in a center part thereof. In other words, the point of application is at a position outward from the edge of the movable side mold 5b mounted to a center part of the movable platen 2.
  • a mold clamping mechanism wherein a tapered member is provided, as a mold clamping force transmitting member, to each of a fixed platen and a movable platen so that mold clamping force is transmitted to the center parts of the fixed platen and the movable platen, thereby allowing a mold clamping force, acting on the fixed platen at the area where the tie bars are mounted, to be transmitted only to the middle part of the fixed platen via the mold clamping force transmitting member, and also allowing a mold clamping force, acting on the movable platen at the area where the movable platen is engaged with one end of a toggle mechanism, to be transmitted only to the middle part of the movable platen via the mold clamping force transmitting member, whereby the deflection of the fixed platen and movable platen is prevented (refer to Japanese Patent Application Laid-Open No. 8-258103 ).
  • a mold clamping mechanism is provided with a load receiving connection member that transmits a force from a toggle type mold clamping mechanism to a movable platen and this load receiving connection member is connected to a movable platen at a position nearer to the center of the movable platen than a portion where a force from the toggle type mold clamping mechanism is received, whereby the deflection of the movable platen is prevented (refer to Japanese Patent Application Laid-Open No. 2003-89133 ).
  • FIG. 7 is a diagram that schematically shows a mold clamping apparatus provided with a mold clamping force transmitting member that transmits a mold clamping force to the middle part of a mold mounting platen, which is described in Japanese Patent Application Laid-Open No. 8-258103 and Japanese Patent Application Laid-Open No. 2003-89133 .
  • a toggle mechanism mounting platen 4 and a mold clamping force transmitting member 7 are connected to each other on their respective four corners by use of tie bars 3.
  • the mold clamping force transmitting member 7 has a protruding leading edge in the shape of a quadrangular truncated pyramid at the middle of one face thereof, which abuts against the middle part of a face of the fixed platen 1 on the side opposite the mold mounting face of the fixed platen.
  • a mold clamping force generated in the tie bar 3 acts on the fixed platen 1 in the middle part thereof via the middle part of the mold clamping force transmitting member 7.
  • a toggle mechanism 6 is attached to the toggle mechanism mounting platen 4 and the other end (a ternary link 6b) thereof is rotatably connected to a staple 6c provided in a peripheral portion of a mold claming force transmitting member 8 on the movable platen 2 side.
  • this mold claming force transmitting member 8 has a tapered shape and a leading end thereof abuts against the middle part of a face of the movable platen 2 on the side opposite the mold mounting face of the movable platen 2.
  • a mold clamping force from the toggle mechanism 6 acts on a middle part of the movable platen 2 via a middle part of the mold claming force transmitting member 8.
  • a reaction force of the mold clamping force from the mold 5 mounted to the middle parts of the fixed platen 1 and movable platen 2 is generated when the mold 5 is clamped.
  • the fixed platen 1 and the movable platen 2 are constructed so that a mold clamping force acts on the middle parts of the fixed platen 1 and movable platen 2 through the mold clamping force transmitting members 7, 8, deflection does not occur in the fixed platen 1 or the movable platen 2 even when deflection occurs in the mold clamping force transmitting members 7, 8 as indicated by broken lines in FIG. 7, as a result, the mold clamping pressure within the mold face can be uniformly maintained. For this reason, in the mold clamping apparatus provided with the mold clamping force transmitting members 7, 8 as in this case, it is unnecessary to fabricate molds by making corrections such as correcting the cavity shape and intentionally lowering the flatness of the mold face.
  • this technique is aimed at eliminating the nonuniformity of pressure acting on the abutted surfaces of the mold, arising from fabrication errors of the toggle mechanism, not aimed at eliminating the nonuniformity of the mold clamping pressure generated from the deflection of the movable platen.
  • a mold clamping force transmitting member which transmits a mold clamping force to a middle part of a mold mounting platen is provided, and a peripheral portion of the mold mounting platen and a peripheral portion of the mold clamping force transmitting member are spaced from each other.
  • This mold clamping apparatus comprises a connection member in a spaced area between the peripheral portion of the mold mounting platen and the peripheral portion of the mold clamping force transmitting member in a manner such that it can be changed from connected state to non-connected state or from non-connected state to connected state.
  • connection member has a portion which abuts against, or connects to, the peripheral portion of the mold mounting platen, on one side thereof, and a portion which abuts against, or connects to, the peripheral portion of the mold clamping force transmitting member, on the other side thereof.
  • the mold clamping force transmitting member may have a leading end surface having a tapered shape that abuts against the middle part of a face of the mold mounting platen on the side opposite the mold mounting face thereof.
  • the spaced area between the peripheral portion of the mold mounting platen and peripheral portion of the mold clamping force transmitting member may be formed having a tapered section, and the connection member may be a wedge-shaped abutting member and may be constructed so as to be inserted into the spaced area having a tapered section, with one surface thereof abutting against a surface of the peripheral portion of the mold mounting platen and the other surface thereof abutting against a surface of the peripheral portion of the mold clamping force transmitting member.
  • the mold clamping apparatus may further comprise connected state changeover means that carries out changeover between a state where the mold clamping force transmitting member and the mold mounting platen are connected to each other via the connection member and a state where the mold clamping force transmitting member is not connected to the mold mounting platen with the interposing of the connection member cancelled.
  • the connected state changeover means carries out changeover between a connected state where when a mold clamping force acts, one side of the connecting member abuts against or connects to the peripheral portion of the mold mounting platen and the other side thereof abuts against or connects to the peripheral portion of the mold clamping force transmitting member and a non-connected state where even when a mold clamping force does or does not act, one side of the connecting member does not abut against or does not connect to the peripheral portion of the mold mounting platen or/and further the other side thereof does not abut against or does not connect to the peripheral portion of the mold clamping force transmitting member.
  • the mold clamping apparatus may further comprise applied connecting force adjusting means that adjusts an abutting force or a connecting force applied to between the mold mounting platen and the mold clamping force transmitting member by interposing the connection member.
  • the abutting force or the connecting force adjusted by the applied connecting force adjusting means is a force that is applied to between the mold mounting platen and the mold clamping force transmitting member when a mold clamping force does not act on a mold mounted on the mold mounting platen.
  • connection member may comprise connected state maintaining means for maintaining a state of abutment or connection between the mold mounting platen and the mold clamping force transmitting member.
  • the connected state maintaining means may be adjusted such that transmission of force by the connection member is started when a mold clamping force that acts on a mold mounted on the mold mounting platen has reached a prescribed value. After adjusting of the magnitude of an abutting force or a connecting force applied to between the mold mounting platen and the mold clamping force transmitting member by use of the applied connecting force adjusting means, the connected state maintaining means may maintain a state where the connection means abuts against, or connects to, a connection area so that a force transmitted by the connection member becomes constant regardless of a mold clamping force.
  • connection means may be a fluid cylinder, one end of which is connected to the peripheral portion of the mold mounting platen and the other end of which is connected to the peripheral portion of the mold clamping force transmitting member.
  • a fluid circuit that supplies a fluid to the fluid cylinder can be closed and opened.
  • connection means may be a turnbuckle, one end of which is connected to the peripheral portion of the mold mounting platen and the other end of which is connected to the peripheral portion of the mold clamping force transmitting member.
  • this turnbuckle may be constructed so as to permit disengagement from connection to the peripheral portion of the mold mounting platen or connection to the peripheral portion of the mold clamping force transmitting member.
  • the mold clamping apparatus comprises a mold clamping force transmitting member which transmits a mold clamping force to a middle part of a mold mounting platen, and a peripheral portion of the mold mounting platen and a peripheral portion of the mold clamping force transmitting member are spaced from each other.
  • the mold clamping apparatus comprises; a connection member in a spaced area between the peripheral portion of the mold mounting platen and the peripheral portion of the mold clamping force transmitting member in a manner such that it can be changed over from connected state to non-connected state or from non-connected state to connected state, and the connection member has a portion which abuts against, or connects to, the peripheral portion of the mold mounting platen, on one side thereof, and a portion which abuts against, or connects to, the peripheral portion of the mold clamping force transmitting member, on the other side thereof; and connected state changeover means that carries out changeover between a state where the mold clamping force transmitting member and the mold mounting platen are connected to each other via the connection member and a state where the mold clamping force transmitting member is not connected to the mold mounting platen with the interposing of the connection member cancelled.
  • the method of mold clamping adjustment comprises the steps of: mounting a mold to a fixed platen and a movable platen; carrying out molding, with the connection member brought into either of a connected state or a non-connected state; measuring the size and shape of a molded article obtained by the molding; carrying out mass-production molding without changing over the connection/non-connection of the connection member when the size and shape of the measured molded article fall in prescribed ranges; carrying out molding again by changing over the connection/non-connection of the connection member when the size and shape of the measured molded article go out of the prescribed ranges; measuring the size and shape of a molded article obtained by the molding carried out again; and carrying out mass-production molding following the molding performed again without changing over the connection/non-connection of the connection member when the size and shape of the measured molded article fall in prescribed ranges.
  • the mold clamping apparatus comprises a mold clamping force transmitting member which transmits a mold clamping force to a middle part of a mold mounting platen, and a peripheral portion of the mold mounting platen and a peripheral portion of the mold clamping force transmitting member are spaced from each other.
  • the mold clamping apparatus comprises; a connection member in a spaced area between the peripheral portion of the mold mounting platen and the peripheral portion of the mold clamping force transmitting member in a manner such that it can be changed over from connected state to non-connected state or from non-connected state to connected state, and the connection member has a portion which abuts against, or connects to, the peripheral portion of the mold mounting platen, on one side thereof, and a portion which abuts against, or connects to, the peripheral portion of the mold clamping force transmitting member, on the other side thereof; connected state changeover means that carries out changeover between a state where the mold clamping force transmitting member and the mold mounting platen are connected to each other via the connection member and a state where the mold clamping force transmitting member is not connected to the mold mounting platen with the interposing of the connection member cancelled; applied connecting force adjusting means that adjusts an abutting force or a connecting force applied to between the mold mounting platen and the mold clamping force transmitting member by interposing the
  • connection member comprises connected state maintaining means for maintaining a state of abutment or connection between the mold mounting platen and the mold clamping force transmitting member.
  • the method of mold clamping adjustment including the steps of: mounting a mold to a fixed platen and a movable platen; carrying out injection molding by use of the mold; measuring the size and shape of a molded article obtained by the injection molding; carrying out mass-production molding when the size and shape of the measured molded article fall in prescribed ranges; changing over a connected/non-connected state by use of the connected state changeover means or adjusting an abutting force or a connecting force applied to between the mold mounting platen and the mold clamping force transmitting member by use of the applied connecting force adjusting means according to differences between the size and shape of the molded article and target values thereof when the size or shape of the measured molded particle goes out of a prescribed range; and carrying out injection molding again, with the condition of abutment or connection between the mold mounting platen and the mold clamping force transmitting member maintained by use of the connected state
  • both a mold that has been subjected to correction so as to prevent the accuracy defect of a molded article that occurs due to the nonuniformity of a mold clamping pressure within the mold face caused by the deflection of a mold mounting platen by a mold clamping force and a mold that has not been subjected to such a correction can be used in the same mold clamping apparatus and a desired molded article accuracy is obtained by using either of the two types of molds.
  • This embodiment is a mold clamping apparatus provided with a mold clamping force transmitting member that transmits a mold clamping force to mold mounting platen (a fixed platen and a movable platen) and differs from a conventional example shown in FIG. 7 in that the mold clamping apparatus is provided with an abutting member 10, a cylinder 11 and a cylinder mounting member 12.
  • Mold clamping force transmitting members 7 and 8 are disposed respectively so as to face a fixed platen 1 and a movable platen 2 which are mold mounting platens. These mold clamping force transmitting members 7, 8 are formed in a tapered shape of a quadrangular truncated pyramid, whereby the mold clamping force transmitting members 7, 8 have function of transmitting a force acting on a peripheral portion of the mold clamping force transmitting members to a middle part of the mold mounting platens.
  • the mold clamping force transmitting member 7 on the fixed platen 1 side and a toggle mechanism mounting platen 4 are connected to each other by the tie bar 3 at their respective four corners, and in this state, a middle part of the mold clamping force transmitting member 7, having the shape of a quadrangular truncated pyramid, abuts against the middle part of a face of the fixed platen 1 on the side opposite the mold mounting face of the fixed platen 1.
  • a ternary link 6b of a toggle mechanism 6 provided on the toggle mechanism mounting platen 4 is rotatably connected to a staple 6c provided in a peripheral portion of the mold clamping force transmitting member 8 on the movable platen 2 side.
  • a mold clamping force from the toggle mechanism 6 acts on a staple 6c mounting position on the mold clamping force transmitting member 8.
  • This force acting on the mold clamping force transmitting member 8 acts on a middle part of the movable platen 2 via a middle part of the mold clamping force transmitting member 8 because a tapered leading end of the mold clamping force transmitting member 8 abuts against the middle part of a face of the movable platen 2 on the side opposite the mold mounting face of the movable platen 2
  • the toggle link expands, moves the mold clamping force transmitting member 8 and the movable platen 2 along the tie bar 3, thereby causing a movable side mold 5b mounted on the movable platen 2 to abut against a fixed side mold 5a mounted on the fixed platen 1.
  • the tie bar 3 elongates and generates a mold clamping force by the reaction force of this elongation of the tie bar 3.
  • a peripheral portion of the mold mounting platen and a peripheral portion of the mold clamping force transmitting member are spaced from each other and, between these peripheral portions, a space (a spaced area) having a tapered section is formed. And the wedge-shaped abutting member 10 as a connection member is inserted into this tapered spaced area and engaged thereto.
  • This abutting member 10 has such a shape that one surface thereof abuts against the mold mounting platens (the fixed platen 1, the movable platen 2) and the other surface thereof abuts against the tapered mold clamping force transmitting members 7, 8. And a cylinder mounting member 12 is provided in each of the mold mounting platens (the fixed platen 1, the movable platen 2), and the abutting member 10 is connected to a piston rod of a cylinder 11 mounted to this cylinder mounting member 12.
  • the abutting member 10 When the wedge-shaped abutting member 10 is pressed into the tapered spaced area of the mold mounting platens (the fixed platen 1, the movable platen 2) and the mold clamping force transmitting members 7, 8 by driving the cylinder 11 by use of an hydraulic circuit or a pneumatic circuit (not shown), thereby causing the piston rod to protrude, the abutting member 10 abuts against the mold mounting platens (the fixed platen 1, the movable platen 2) and the mold clamping force transmitting members 7, 8, whereby the mold mounting platens (the fixed platen 1, the movable platen 2) and the mold clamping force transmitting members 7, 8 are connected to each other so that the fixed platen 1 and the mold clamping force transmitting members 7 and also the movable platen 2 and the mold clamping force transmitting members 8 become a substantially integrated structure, respectively.
  • connection/non-connection changeover means that changes over the state between the mold mounting platens (the fixed platen 1, the movable platen 2) and the mold clamping force transmitting members 7, 8 to a connected or non-connected state by use of the abutting member 10, applied connecting force adjusting means that adjusts an abutting force to be applied, and abutting state maintaining means.
  • the wedge-shaped abutting member 10 In bringing the mold mounting platens (the fixed platen 1, the movable platen 2) and the mold clamping force transmitting members 7, 8 into a connected state, the wedge-shaped abutting member 10 is pressed into the gap between the mold mounting platens and the mold clamping force transmitting members 7, 8 by use of the cylinder 11, whereas in bringing the mold mounting platens (the fixed platen 1, the movable platen 2) and the mold clamping force transmitting members 7, 8 into a non-connected state, the wedge-shaped abutting member 10 is withdrawn by the cylinder 11.
  • the adjustment of the magnitude of an abutting force to be applied is performed by adjusting a hydraulic pressure or a pneumatic pressure to be applied to the cylinder 11, with a mold clamping force not acting on the gap between the movable side mold 5a and the fixed side mold 5b.
  • a hydraulic pressure or a pneumatic pressure to be applied By closing the hydraulic circuit or pneumatic circuit annexed to the cylinder 11 and trapping the oil or the air in the cylinder 11 after the adjustment of the magnitude of an abutting force to be applied, it is possible to maintain a connected state of the mold mounting platens (the fixed platen 1, the movable platen 2) and the mold clamping force transmitting members 7, 8.
  • a piston lock mechanism is annexed to the cylinder 11, it is also possible to maintain a connected state by making the piston lock mechanism effective.
  • the fact that the connected state of the mold mounting platens and the mold clamping force transmitting members is maintained means that the wedge-shaped abutting member 10 is inserted into the tapered space (spaced area) formed between the mold mounting platens and the mold clamping force transmitting members and that an abutting position on both of the mold mounting platens and the mold clamping force transmitting members where the wedge shaped abutting members 10 abutting thereon is maintained.
  • An abutting force to be applied refers to forces that act on each other between the abutting member 10 and the mold mounting platens (the fixed platen 1, the movable platen 2) and between the abutting member 10 and the mold clamping force transmitting members 7, 8 at the point in time of contact of the movable side mold 5b with the fixed side mold 5a (i.e., at the point in time of mold touch).
  • the magnitude of the hydraulic pressure or pneumatic pressure applied to the cylinder 11 is adjusted and a prescribed abutting force is applied to the abutting member 10, whereby the mold mounting platens (the fixed platen 1, the movable platen 2) and the mold clamping force transmitting members 7, 8 are maintained in a close contact condition through the abutting member 10.
  • the toggle mechanism is driven, the mold clamping force transmitting member 8 and the movable platen 2 move forward in an integrated manner (i.e., move toward the fixed platen 1 side), and the movable side mold 5b mounted on the movable platen 2 abuts against the fixed side mold 5a mounted on the fixed platen 1, and then mold clamping process proceeds.
  • mold clamping force transmitting members 7, 8 deflect as indicated by broken lines in FIG. 1.
  • the position of the abutting member 10 may also be adjusted so that the abutting member 10 does not abut against the mold mounting platens (the fixed platen 1, the movable platen 2) and the mold clamping force transmitting members 7, 8 until mold clamping process has proceeded and mold clamping force has increased to a certain degree.
  • the hydraulic circuit or pneumatic circuit of the cylinder 11 may be designed to operate when a mold clamping force caused by the toggle mechanism has reached a prescribed value, allowing the wedge-shaped abutting member 10 to enter the tapered spaced area of the mold clamping force transmitting members 7, 8 and the mold mounting platens (the fixed platen 1, the movable platen 2) and the mold clamping force transmitting members 7, 8 and the mold mounting platens (the fixed platen 1, the movable platen 2) to be connected to each other via the abutting member.
  • a mold clamping force sensor may be provided so that values detected by the sensor are used for the determination.
  • a mold clamping force may be converted into the cross head position so that it is judged that a mold clamping force has reached a prescribed value when the cross head has reached a prescribed position.
  • the second embodiment shown in FIG. 2 differs from the first embodiment in that a bolt 13 is used in place of the cylinder.
  • the shape of an abutting member 10 is the same as in the first embodiment.
  • a bolt attachment member 14 which has a bolt hole into which a bolt 13 is screwed, is attached to mold mounting platens (a fixed platen 1, a movable platen 2).
  • An abutting member 10 is fixed to a leading end of the bolt 13 that is screwed into the bolt hole of this bolt attachment member 14.
  • This abutting member 10 is inserted into a space having a tapered section (a spaced area) that is formed between peripheral portions of the mold mounting platens (the fixed platen 1, the movable platen 2) and peripheral portions of mold clamping force transmitting members 7, 8, and engaged to this space.
  • the height of the bolt 13 relative to the bolt attachment member 14 is adjusted by turning the bolt 13, whereby the position of the abutting member 10 in the tapered spaced area can be adjusted.
  • the reference numeral 15 denotes a lock nut, which is used to fix the height of the bolt 13 relative to the bolt attachment member 14.
  • a sufficient gap is provided between the abutting member 10 and at least of one of the mold mounting platens (the fixed platen 1, the movable platen 2) or the mold clamping force transmitting members 7, 8.
  • the gap between the mold mounting platens (the fixed platen 1, the movable platen 2) and the mold clamping force transmitting members 7, 8 is brought into a non-connected state.
  • the height of the bolt 13 is adjusted in advance by turning the bolt 13 and adjustment is made beforehand so that the abutting member 10 abuts against the mold mounting platens (the fixed platen 1, the movable platen 2) and the mold clamping force transmitting members 7, 8 with a prescribed abutting force that is applied.
  • the mold mounting platens (the fixed platen 1, the movable platen 2) and the mold clamping force transmitting members 7, 8 are brought into a connected state via the abutting member 10 and thereafter a mold clamping force is caused to continue increasing, the mold clamping force transmitting members 7, 8 deflect as indicated by broken lines in FIG. 2.
  • the deflection of the mold clamping force transmitting members 7, 8 is transmitted to the mold mounting platens (the fixed platen 1, the movable platen 2) via the abutting member 10, and the mold mounting platens deflect by an amount corresponding to the amount of the deflection of the mold clamping force transmitting members 7, 8.
  • the position of the abutting member 10 may also be adjusted so that the abutting member 10 does not abut against the mold mounting platens (the fixed platen 1, the movable platen 2) and the mold clamping force transmitting members 7, 8 until mold clamping process has proceeded and mold clamping force has increased to a certain degree.
  • connected/non-connected state changeover means and applied abutting force adjusting means are constituted by the bolt 13 and abutting state maintaining means is constituted by the lock nut 15.
  • the gap between the peripheral portions of the mold mounting platens and the peripheral portions of the mold clamping force transmitting members 7, 8 is a spaced area having a tapered section, and the wedge-shaped abutting member 10 (the connection member) is inserted into this spaced area.
  • this abutting member 10 is caused to abut against the mold mounting platens (the fixed platen 1, the movable platen 2) and the mold clamping force transmitting members 7, 8 (that is, whether mold mounting platens and the mold clamping force transmitting members are brought into a connected state or a non-connected state via the abutting member 10)
  • selection can be made by the operation of the cylinder 11 or the bolt 13 as to whether or not the deflection of the mold clamping force transmitting members 7, 8 due to a mold clamping force is transmitted to the mold mounting platens (the fixed platen 1, the movable platen 2).
  • the wedge-shaped abutting member 10 may be constructed so as to be attachable and detachable.
  • a flanged portion is provided in a top portion of the wedge-shaped abutting member 10, the wedge-shaped portion of the abutting member 10 is inserted into the tapered spaced area in the peripheral portions of the mold mounting platen and mold clamping force transmitting members, the wedge-shaped portion of the abutting member 10 is brought into a close-bonded state with the mold mounting platen and the mold clamping force transmitting member so that they are connected to each other, and the flanged portion of the wedge-shaped abutting member 10 is firmly fixed to the mold mounting platen by use of a bolt and the like to ensure that the deflection of the mold clamping force transmitting members due to a mold clamping force is transmitted to the mold mounting platens.
  • the above-described connected/non-connected state changeover means is not provided and a changeover by manual work is performed.
  • the above-described abutting state maintaining means is constituted by a fixing jig, such as a bolt to be attached to the mold mounting platen in the flanged portion of the abutting member 10.
  • an abutting force to be applied may be adjusted by interposing a shim or the like between the flanged portion of the abutting member 10 and the mold mounting platen and changing the degree of the insertion of the wedge-shaped portion of the abutting member into the tapered spaced area between the mold mounting platen and the mold clamping force transmitting member.
  • a mold clamping apparatus in this embodiment is provided with mold clamping force transmitting members 7, 8 that transmit a mold clamping force to middle parts of mold mounting platens (a fixed platen 1, a movable platen 2). Peripheral portions of the mold mounting platens (a fixed platen 1, a movable platen 2) and peripheral portions of the mold clamping force transmitting members 7, 8 are spaced from each other and a cylinder 16 (a hydraulic cylinder or a pneumatic cylinder) as a connecting member is provided in the spaced area.
  • a cylinder 16 a hydraulic cylinder or a pneumatic cylinder
  • One end of the cylinder 16 is attached to the peripheral portions of the mold mounting platens (a fixed platen 1, a movable platen 2) and the other end thereof is attached to the peripheral portions of the mold clamping force transmitting members 7, 8.
  • the generation direction of a hydraulic force or a pneumatic force of the cylinder 16 coincides substantially with the operation direction of the movable-mold mounting platen.
  • connected/non-connected state changeover means, applied connecting force adjusting means and connecting state maintaining means are constituted by the cylinder 16 (shown) and a hydraulic circuit or a pneumatic circuit (not shown).
  • a hydraulic force or a pneumatic force is applied in the direction in which the spaced area between these mold mounting platen and the mold clamping force transmitting member is widened.
  • a hydraulic port or a pneumatic port of the cylinder 16 is opened. The adjustment of a connecting force applied to between the mold mounting platen and the mold clamping force transmitting member is made by adjusting the hydraulic pressure or pneumatic pressure applied to the cylinder 16, under the condition where a mold clamping force does not act on the mold.
  • the fourth embodiment shown in FIG. 4 differs from the third embodiment in that connection means using screws is used in place of the cylinder.
  • the mold clamping apparatus of this embodiment is not provided with connected/unconnected state changeover means.
  • FIG. 5 is an enlarged view of connection means in the fourth embodiment.
  • This connection means is a turnbuckle 20, and two kinds of female screw parts are provided in a nut 21 of the turnbuckle 20.
  • a male screw 22 is a right-handed screw
  • a left-handed screw is used as a male screw 23 and correspondingly, a right-handed female screw is used as the female screw part of the nut 21 on the left side of FIG. 5, while a left-handed female screw is used as the female screw part on the right side.
  • Connecting state maintaining means is a lock nut 24 and a lock nut 25.
  • one of the pins 26 that connect the male screw 22 and the mold clamping force transmitting members 7, 8 or the pins 26 that connect the male screw 23 and the mold mounting platens (the fixed platen 1, the movable platen 2) is detachably/attachably designed, and this pin 26 is removed.
  • an abutting force or a connecting force applied to between the mold mounting platen and the mold clamping force transmitting member can be adjusted by use of the above-described adjusting means of an abutting force or a connecting force applied even when a mold clamping force is applied to the mold.
  • adjusting means of an abutting force or a connecting force applied even when a mold clamping force is applied to the mold For example, when a mold claming force necessary for injection has been generated after the completion of mold clamping, it is possible to adjust a hydraulic pressure or a pneumatic pressure while measuring the amount of deformation of the mold mounting platen or to make adjustment by turning the bolt 13 and the nut 21 so that a desired amount of deformation can be obtained.
  • the mold to be used is a mold corrected to cope with the deflection of the mold mounting platens (the fixed platen 1, the movable platen 2), i.e., a mold corrected so that a prescribed accuracy of a molded article is obtained even when the mold mounting platens (the fixed platen 1, the movable platen 2) deflect due to a mold clamping force, the mold mounting platens (the fixed platen 1, the movable platen 2) and the mold clamping force transmitting members 7, 8 are brought into a connected state by use of the connection member so that the deflection of the mold clamping force transmitting members 7, 8 is transmitted to the mold mounting platens (the fixed platen 1, the movable platen 2).
  • the connection between the mold mounting platens (the fixed platen 1, the movable platen 2) and the mold clamping force transmitting members 7, 8 is canceled by operating the connection means.
  • the mold to be used is a mold fabricated by making corrections to cope with the deflection of the mold mounting platens or a mold fabricated without making corrections
  • the mold is mounted on the fixed platen and the movable platen and molding is performed, with the connection member brought into either a "non-connected state” or a "connected state.”
  • the size and shape of a molded article obtained by the molding are measured.
  • mass-production molding is performed under the condition (non-connected state or connected state) of the connection member where the aforementioned molded article was molded.
  • injection mold is performed, with a mold mounted on the fixed platen and the movable platen, and the size and shape of a molded article obtained by the injection molding are measured.
  • mass-production molding is performed under the above conditions of the injection molding.
  • connection condition of the mold mounting platens (the fixed platen 1, the movable platen 2) and the mold clamping force transmitting members 7, 8 is changed over from a connected state to a non-connected state or from a non-connected state to a connected state, or a connecting force to be applied is adjusted according to differences between the size and shape of the injected article and target values thereof, and thereafter injection molding is performed again.
  • this changeover operation of a connected/non-connected state and/or the adjustment operation of a connecting force to be applied is repeatedly performed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
EP07104095A 2006-03-23 2007-03-14 Mold clamping apparatus for injection molding machine Withdrawn EP1837152A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006080676A JP4047892B2 (ja) 2006-03-23 2006-03-23 射出成形機の型締装置

Publications (1)

Publication Number Publication Date
EP1837152A1 true EP1837152A1 (en) 2007-09-26

Family

ID=38042687

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07104095A Withdrawn EP1837152A1 (en) 2006-03-23 2007-03-14 Mold clamping apparatus for injection molding machine

Country Status (4)

Country Link
US (1) US20070222097A1 (ja)
EP (1) EP1837152A1 (ja)
JP (1) JP4047892B2 (ja)
CN (1) CN101041255A (ja)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5276953B2 (ja) * 2008-11-06 2013-08-28 東芝機械株式会社 型締装置及び射出成形機
JP5180131B2 (ja) * 2009-03-30 2013-04-10 ファナック株式会社 射出成形機の固定プラテン
JP5604915B2 (ja) * 2010-03-08 2014-10-15 宇部興産機械株式会社 型締装置
JP5572427B2 (ja) * 2010-03-12 2014-08-13 東芝機械株式会社 ダイプレートユニット、型締装置、射出成形機および射出成形方法
US8425221B2 (en) * 2010-12-03 2013-04-23 Cheng Uei Precision Industry Co., Ltd. Mold assembly having ejection mechanism
TW201228799A (en) * 2011-01-07 2012-07-16 Acumen Co Ltd Electrical injection molding machine
JP5634899B2 (ja) * 2011-01-31 2014-12-03 住友重機械工業株式会社 型締装置
JP5682488B2 (ja) * 2011-07-12 2015-03-11 株式会社豊田自動織機 型締装置
JP5977116B2 (ja) * 2012-08-27 2016-08-24 ファナック株式会社 射出成形機の型締装置
JP5681235B2 (ja) * 2013-06-05 2015-03-04 ファナック株式会社 射出成形機の型締装置
JP5800881B2 (ja) * 2013-11-06 2015-10-28 ファナック株式会社 射出成形機の金型取付盤
JP6177703B2 (ja) * 2014-02-04 2017-08-09 住友重機械工業株式会社 射出成形機
JP2017052263A (ja) * 2015-09-10 2017-03-16 プロウエル カウンター コーポレーション 自動平行移動型板の組立体、自動平行静止型板の組立体及びその射出装置
CN110962314B (zh) * 2019-11-15 2022-05-17 海天塑机集团有限公司 一种减小注塑机在合模时拉杆的应力幅的方法
CN110815718B (zh) * 2019-11-28 2021-05-07 浙江百得塑业有限公司 一种塑料勺注塑成型工艺
JP7061246B1 (ja) 2021-08-06 2022-04-28 株式会社西浦化学 金型成形機
KR102688338B1 (ko) * 2022-10-17 2024-07-25 엘지전자 주식회사 금형 장치

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3038274A1 (de) * 1980-10-10 1982-05-27 Desma-Werke Gmbh, 2807 Achim Formvorrichtung mit einer zwischen druckplatten, mehrteiligen form
US5776402A (en) * 1995-06-07 1998-07-07 Husky Injection Molding Systems Ltd. Injection molding machine having a uniformly compressible platen and process for preventing flash formation
DE10214458A1 (de) 2002-03-30 2003-10-16 Lehmann Gmbh & Co Kg Vorrichtung zum Spritzgießen von Formteilen aus Kunststoff

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4941107B1 (ja) * 1970-05-13 1974-11-07
JP2958704B2 (ja) * 1990-08-03 1999-10-06 株式会社小松製作所 射出成形機等の型締装置
JPH07135233A (ja) * 1993-11-11 1995-05-23 Toshiba Corp 半導体モールド装置
JP3591908B2 (ja) * 1995-03-20 2004-11-24 ファナック株式会社 射出成形機の型締機構
JP4203872B2 (ja) * 1999-03-30 2009-01-07 株式会社ニイガタマシンテクノ 射出成形機の型締装置
JP3835948B2 (ja) * 1999-05-28 2006-10-18 三菱重工プラスチックテクノロジー株式会社 電動式型締装置
JP2002240118A (ja) * 2001-02-20 2002-08-28 Meiki Co Ltd 型締装置
JP3715246B2 (ja) * 2001-07-13 2005-11-09 住友重機械工業株式会社 射出成形機の可動金型支持装置
JP3910389B2 (ja) * 2001-08-31 2007-04-25 住友重機械工業株式会社 成形機の可動金型支持装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3038274A1 (de) * 1980-10-10 1982-05-27 Desma-Werke Gmbh, 2807 Achim Formvorrichtung mit einer zwischen druckplatten, mehrteiligen form
US5776402A (en) * 1995-06-07 1998-07-07 Husky Injection Molding Systems Ltd. Injection molding machine having a uniformly compressible platen and process for preventing flash formation
DE10214458A1 (de) 2002-03-30 2003-10-16 Lehmann Gmbh & Co Kg Vorrichtung zum Spritzgießen von Formteilen aus Kunststoff

Also Published As

Publication number Publication date
US20070222097A1 (en) 2007-09-27
JP4047892B2 (ja) 2008-02-13
JP2007253458A (ja) 2007-10-04
CN101041255A (zh) 2007-09-26

Similar Documents

Publication Publication Date Title
EP1837152A1 (en) Mold clamping apparatus for injection molding machine
JP5801924B2 (ja) 射出成形機の成形方法
US8043083B2 (en) Movable platen support mechanism
WO2006115141A1 (ja) 型締装置、射出成形機及び射出成形方法
US20030168198A1 (en) Multiple-slide die-casting system
EP0396773B1 (en) Injection press machine and its molding method
EP1457303B1 (en) Clamping mechanism for a molding machine
CN106002364A (zh) 一种工字型材数控加工装夹装置
US6519996B1 (en) Pressing-bending machine with a device for detecting the lower and upper cross-members deflection, aimed at interacting with at least one crowning system
CN112317563A (zh) 一种汽车钢板钣金修复设备
JP3152601B2 (ja) ディスク射出成形金型の固定側と可動側の円盤キャビティプレートの整列案内装置
CN114719717B (zh) 冲压模具的修模方法
US20220396020A1 (en) Clamping unit for a moulding machine and moulding machine comprising such a clamping unit
JPH091601A (ja) 樹脂成形用金型
TWI503219B (zh) A thin plate injection molding method and a thin plate injection press forming apparatus
KR100644914B1 (ko) 멀티 슬라이드 다이캐스팅 기기의 분리형 링 토글
JP6811212B2 (ja) 金型取り付け方法及び射出成形機
KR100663269B1 (ko) 상형금형의 언더컷 성형장치
JP4463787B2 (ja) 射出成形機の型締装置
US5861181A (en) Die casting machines frame modification
JP3175806B2 (ja) 型締装置の据付構造および据付方法
JP3160392U (ja) 圧造成形機
CN112895397B (zh) 一种精准的模具定位装置
JP3658203B2 (ja) 圧造成形機
JP7348158B2 (ja) 射出成形金型

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK YU

17P Request for examination filed

Effective date: 20071203

17Q First examination report despatched

Effective date: 20070115

R17C First examination report despatched (corrected)

Effective date: 20080115

AKX Designation fees paid

Designated state(s): DE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20090811